Migrating deployment processes and Continuous Integration at SAP SEto a future-proof design using SLES12, Chef, GitHub, OBS and KIWI

Florian Winkler

Linux Consultant & Trainer

B1 Systems GmbH

winkler@b1-systems.de

Eike Waldt

Linux Consultant & Trainer

B1 Systems GmbH

waldt@b1-systems.de

2

Introduction

3

Introducing B1 Systems

● founded in 2004● operating both nationally & internationally● ~ 100 employees● vendor-independent (software & hardware)● SUSE consulting & training partner● focus:

– consulting

– support

– training

– development

– operations

– solutions

4

Areas of expertise

Monitoring

NAGIOS RHEL

Linux Operating Systems

Systems Management

Cloud Computing

KVM

XEN

Virtualization

ICINGA

Configuration Management

PUPPET

SALT ANSIBLE

RH SATELLITE

SPACEWALK

SUSE MANAGER

SLES

DEBIAN

UBUNTU

MIRANTIS

SUSE CLOUD

RH OSP

OPENSTACK

Virtualization

5

Who we are

● Eike Waldt– Linux Consultant & Trainer

– B1 employee since 05/2015

● Florian Winkler– Linux Consultant & Trainer

– B1 employee since 04/2014

6

Close collaboration of ...

– SaaS Cloud

– HANA Enterprise Cloud

– SAP Managed Service – SaaS Cloud Managed Services

7

Agenda

• Motivation and goals

• Software used

• Landscapes and processes

• GMP - Global Management Portal

• Operating system images

• Deployment

• Chef – Configuration management

• Version control

• Workflow

• GMP - Integration of new tools

• Chef design @ SAP’s clouds

• Conclusion

• Outlook

8

Motivation and goals

9

Motivation and goals

● SLES12 SP1 at the doorstep

– all the changes that come with it …● historically grown deployment process

– reinvent this completely

– state of the art technology● no real configuration management so far● we wanted a fancy DevOps approach xD● regaining a common base between several cloud landscapes

10

Software used

11

Software used

● SUSE Linux Enterprise Server 12● Open Build Service● kiwi(-ng)● jenkins● GitHub Enterprise● chef● chefdk● Berkshelf● test-kitchen● docker

12

Landscape overview

13

Admin

Customer

GMP

ResourcePools

SaaS

HEC

landscapes

landscapes

Bare Metal Hypervisor

Xen KVM VMware

Virtual Machines

HardwarePools

VMPools

Pools

Landscape overview

HEC 13 landscapes 13 Dcs13.000 VMs 800 hypervisors 1.700 BareMetal

SaaS 19 landscapes 8 DCs32.000 VMs 3.700 hypervisors 1.100 Baremetal

HEC

SaaS

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GMP - Global Management Portal

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Global Management Portal (GMP)

– network

• network ranges

• DHCP

• DNS

– hypervisor administration and deployment

– virtual machine administration and deployment

● customer frontend● inventory database

– operating system images

– monitoring

– LDAP administration

– storage administration

– remote execution tool

– auditing

• SAP internal development• orchestration platform for ...

16

Operating system images

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OS images - ye olde way

● dump/restore a Goldmaster VM

– update VM via “zypper up”

– make changes directly in VM

– different VMs for different image types

• hypervisor

• virtual machines

Pitfalls

• waste of resources

• dumping a running system is unclean

• no good version control/changelog

• no reproducible builds

• you do not really know what you are deploying

18

OS images - the fancy way

● build images with kiwi in OBS

– define content

• in descriptive language

• in file form

– kiwi files and xml in git

– minimalistic image approach

Benefits

• integration in already existing OBS

• clean build

– contents of the images are well-defined

– reproducible builds

• release management

• ease of customization

• great changelog in git

• faster deployment

• up-to-date packages

19

Deployment

20

Deployment - ye olde way

1) (PXE boot)

2) Restore dumped image

3) (Re)boot

4) Fetch/execute firstboot script

a) perl scripts

b) config file templates

c) daemons to

enable/start/disable/stop

d) platform, DC specific parameters

5) Reboot

6) Machine is ready

Pitfalls

• data stored in files

• unmaintainable

• no “good” version control/changelog

• no reproducible builds

21

Deployment - the fancy way

1) (PXE boot)

2) Restore kiwi image

3) (Re)boot

4) cloud-init

a) network settings

b) chef-client settings

5) Execute chef-client

a) config file templates

b) daemons to enable/start/disable/stop

c) platform, DC specific parameters

6) Reboot

7) Machine is ready

Benefits● clean deployment● everything is kept in git● great changelog in git● way more maintainable

22

Chef - ConfigManagement

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Chef design basics

● client/server architecture● stored data

– attributes defined in roles

• execution of code

– cookbooks/recipes

• design of dependencies

– roles for landscapes/DCs (attributes)

– nested roles for pools/customers/applications

– run_list defines all roles and recipes for a client group or a single client

• lifecycle and release management

– environments define cookbook versions

24

Version control

25

Version control - ye olde way and what doesn’t come with it

● local SVN repo for Perl scripts

– only firstboot under control

– no version control for external sources

Pitfalls

• no real AAA

• no QA workflow

• no approval workflow

26

Version control - the fancy wayand what comes with it

● git(hub) for almost everything

– kiwi files

– cookbooks

• in their own separate repositories

– chef environments

Benefits

• github is a well-known tool

• using SAP’s internal github-enterprise

• real AAA

• Development /testing/ approvement/rollout workflows

27

Workflow

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Workflowdev/test/deploy

github

jenkins

chef-server

GMP

admin

test environment docker/Xen hypervisor

development workstation direct

indirect

chef-server

29

GMP (Global Management Portal) –Integration of new tools

30

Global Management Portal (GMP)

– network

• network ranges

• DHCP

• DNS

– hypervisor administration and deployment

– virtual machine administration and deployment

● customer frontend● inventory database

– operating system images

– monitoring

– LDAP administration

– storage administration

– remote execution tool

– auditing

• SAP internal development• orchestration platform for ...

31

GMP integration

● automated chef-server install● chef-server tasks

– manipulating node objects

• configuration database and mapping of entities

– images to pools

– chef-servers to pools

– attributes to landscapes/pools

– run_list to pools/nodes● automated sync: GMP → (git) → chef-server

– landscape attributes (roles)

– environments, cookbooks and roles

32

Chef design @ SAP’s clouds

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Chef design @ SAP’s cloudsAdmin

Hardware Pools

SaaS HEC

run_list

attributes

role

chef-server

GMP

Resource Pool: DC1-Customer 1

Resource Pool: DC2-Customer 2

Customer 1

environment

VM Pools

Hypervisorrun_list

Hypervisorrun_list

attributes

role

Bare Metalrole run_list

single attribute

chef-server

Customer 2

Landscape "SaaS 01"

Landscape "SaaS 02"

single attribute

attributes

role

attributes

base_role

attributes

bas_role run_list

environment

attributesattributes

rolerole

34

Conclusion

35

Conclusion

● cleaned up deployment process● working configuration management● way better testing and integration workflow

– implementing CI and CD● identical infrastructure code in both SAP clouds● future-proof

– ready for new OS versions

36

Outlook

37

Outlook

● application deployment via Chef● in-depth customization from customer side

– cookbooks

– coles

– own chef servers (unmanaged)● “backporting” deployment to SLES 11● establishing configuration management for SLES11

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Thank you

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Thank you for making this possible!

● Tools team

– Sebastian Koehn

– Sven Schubert

● HEC XEN team

– Florian Kellmer

– Ralf Lang

– Christian Wolter

● MCD team

– Tino Kaufmann

– Alexander Lode

● SaaS Cloud team

– Daniel Schier

– Tobias Stolz

– Ronny Tiebel

• ticketweb

– Sebastian Krieger

40

Questions?

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